Add GN output prefix override and allow empty output extensions.

tools/gn/binary_target_generator.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/binary_target_generator.h"
 
 #include "tools/gn/config_values_generator.h"
 #include "tools/gn/deps_iterator.h"
 #include "tools/gn/err.h"
 #include "tools/gn/functions.h"
@@ skipping 13 matching lines @@
 
 BinaryTargetGenerator::~BinaryTargetGenerator() {
 }
 
 void BinaryTargetGenerator::DoRun() {
   target_->set_output_type(output_type_);
 
   if (!FillOutputName())
     return;
 
+  if (!FillOutputPrefixOverride())
+    return;
+
   if (!FillOutputExtension())
     return;
 
   if (!FillSources())
     return;
 
   if (!FillPublic())
     return;
 
   if (!FillCheckIncludes())
@@ skipping 34 matching lines @@
 bool BinaryTargetGenerator::FillOutputName() {
   const Value* value = scope_->GetValue(variables::kOutputName, true);
   if (!value)
     return true;
   if (!value->VerifyTypeIs(Value::STRING, err_))
     return false;
   target_->set_output_name(value->string_value());
   return true;
 }
 
+bool BinaryTargetGenerator::FillOutputPrefixOverride() {
+  const Value* value = scope_->GetValue(variables::kOutputPrefixOverride, true);
+  if (!value)
+    return true;
+  if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
+    return false;
+  target_->set_output_prefix_override(value->boolean_value());
+  return true;
+}
+
 bool BinaryTargetGenerator::FillOutputExtension() {
   const Value* value = scope_->GetValue(variables::kOutputExtension, true);
   if (!value)
     return true;
   if (!value->VerifyTypeIs(Value::STRING, err_))
     return false;
   target_->set_output_extension(value->string_value());
   return true;
 }
 
@@ skipping 26 matching lines @@
           "deps.");
       return false;
     }
   }
 
   // Add to the set.
   for (const auto& cur : circular)
     target_->allow_circular_includes_from().insert(cur);
   return true;
 }